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I also would go with B out of those two selections. 1. Because it has the digital ballast rather than the magnetic. These are more energy efficient and they run at a cooler temperature. 2. Because you get both the bulbs with the package...

But I also would agree with Muse, an air-cooled hood seems to be the best way to go, imo. This is the light I'm planning on ordering when I'm ready. I know its 1k, not 400, but you get the idea...

Right, but after reading the reviews and emailing the company, waiting 7 days to hear back from them, I went with HTGSupply. They replied to my emails instantly and warrantee the bulb and ballast for a long time.